EP0621392B1 - Automatic tensioning and locking device for roller blinds and mosquito-curtains - Google Patents

Automatic tensioning and locking device for roller blinds and mosquito-curtains Download PDF

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Publication number
EP0621392B1
EP0621392B1 EP94200784A EP94200784A EP0621392B1 EP 0621392 B1 EP0621392 B1 EP 0621392B1 EP 94200784 A EP94200784 A EP 94200784A EP 94200784 A EP94200784 A EP 94200784A EP 0621392 B1 EP0621392 B1 EP 0621392B1
Authority
EP
European Patent Office
Prior art keywords
roller
pin
netting
drive bush
fabric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94200784A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0621392A3 (en
EP0621392A2 (en
Inventor
Alberto Bianchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ACRIMO ITALIA Srl
Original Assignee
ACRIMO ITALIA Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ACRIMO ITALIA Srl filed Critical ACRIMO ITALIA Srl
Publication of EP0621392A2 publication Critical patent/EP0621392A2/en
Publication of EP0621392A3 publication Critical patent/EP0621392A3/en
Application granted granted Critical
Publication of EP0621392B1 publication Critical patent/EP0621392B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/60—Spring drums operated only by closure members
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
    • E06B9/40—Roller blinds
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/52—Devices affording protection against insects, e.g. fly screens; Mesh windows for other purposes
    • E06B9/54—Roller fly screens
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/80—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling
    • E06B9/82—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic
    • E06B9/90—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic for immobilising the closure member in various chosen positions
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/56—Operating, guiding or securing devices or arrangements for roll-type closures; Spring drums; Tape drums; Counterweighting arrangements therefor
    • E06B9/80—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling
    • E06B9/82—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic
    • E06B9/90—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic for immobilising the closure member in various chosen positions
    • E06B2009/905—Safety measures against dropping or unauthorised opening; Braking or immobilising devices; Devices for limiting unrolling automatic for immobilising the closure member in various chosen positions using wrap spring clutches

Definitions

  • This invention relates to an automatic tensioning and locking device for roller blinds and mosquito-curtains.
  • roller blinds and mosquito-curtains various devices have been proposed for laterally guiding the fabric or netting in such a manner as not to allow even small apertures to be formed.
  • Devices have also been applied to blinds and/or mosquito-curtains for tensioning the fabric or netting when completely unrolled to cover the corresponding window or opening.
  • One of these known devices consists of a combination of mutually rotating parts installed in proximity to and/or on the support shaft for the fabric and/or netting winding roller. These parts are arranged at the required distance and in the required position on mounting the roller box on the window such as to determine a fixed limited extent of unwinding of the fabric and/or netting from the roller equal to the height of the window.
  • the tensioning of the fabric and/or netting when in its maximum unwound position is determined by the upper locking of the fabric and/or netting by said device, which prevents rotation of the roller, and the lower locking by hooking elements acting on a bar situated at the free end of the fabric and/or netting and also acting as a gripping handle.
  • This device for adjusting the unwinding height of the fabric and/or netting therefore requires complicated setting-up during installation or mounting of the blind or mosquito-curtain, which is not always within the capacity of the final user.
  • both the roller support pins have to be used for its construction.
  • the first pin is surrounded by the spring for the return or rewinding of the fabric and/or netting, and the second pin supports and houses the device for adjusting the unwinding height of the fabric and/or netting.
  • This arrangement of elements on both pins also results in complications during mounting and installation.
  • An object of the present invention is therefore to provide a device for tensioning unwound roller blinds and mosquito-curtains which does not require any setting by the installer of the blind or mosquito-curtain.
  • a further object is to enable this device to tension and lock the fabric and/or netting independently of the height of the window or opening to which it is applied.
  • an automatic tensioning and locking device for fabric and/or netting roller blinds and mosquito-curtains to be associated with a roller box endpiece provided with a support pin for a winding roller in which a return spring and a drive bush for said roller interact between said roller and said support pin, characterised in that about said drive bush there is wound a spring the ends of which alternately abut against a cam unit which is rotatable coaxially with the drive bush and carries a pin which interacts with an elastically loaded stop element rockable at least between a position in which said fabric and/or netting can freely unwind, a position in which unwinding/rewinding are prevented with stoppage of said pin, and a position in which said fabric and/or netting can be wound.
  • FIG 1 is a schematic view of a mosquito-curtain, indicated overall by 11, applied to a window frame indicated by 12.
  • the mosquito-curtain or alternatively the blind, both of roller type, consists essentially of a roller box 13 containing a netting 14 or fabric sheet, guided slidingly along the longitudinal sides within suitable guides provided with seal brushes 15.
  • the netting 14 is wound on a roller, not shown, contained in the box 13 and supported on support pins 16, only one of which is shown, these being connected to its ends and secured to endpieces 17.
  • a return spring shown schematically at 18 is interposed and interacts between the illustrated support pin 16 and the roller (not shown).
  • the return spring 18 is of the spiral type, and is supported and fixed at that end facing the roller by a bush 19 used both to load it to an extent sufficient for rewinding the netting 14 onto the roller and to position it over the other support pin, not shown.
  • a drive bush 20 which usually engages in a groove in the roller.
  • the bottom of the netting 14 is provided transversely with a bar 21 also acting as a handgrip and also guided laterally in the lateral guides 15.
  • the ends of the bar 21 are used as elements for positioning the bar 21 at stop elements, shown schematically at 22 and positioned at the lower end of the lateral guides 15.
  • Figure 2 also shows, positioned in correspondence with the endpiece 17, an automatic tensioning and locking device according to the invention for the netting of the roller mosquito-curtain.
  • this device consists essentially of a further spiral spring 23 wound about the drive bush 20 with its ends 24, 25 abutting alternately against a cam unit rotatable coaxially with the drive bush 20.
  • the cam unit comprises a pin 26 which interacts with an elastically loaded stop element 27 rockable at least between a position in which said fabric and/or netting can freely unwind, a position in which unwinding/rewinding are prevented with stoppage of said pin, and a position in which said fabric and/or netting can be wound.
  • FIGS 3 and 4 show more clearly the structure of the cam unit, which consists of two elements indicated overall by 28 and 29 respectively.
  • a first element 28 comprises a cylindrical portion 30 rigid with and projecting from a flange portion 31 of greater diameter.
  • the cylindrical portion 30 is provided with a pair of diametrically opposing radial notches 32 and 33, one being larger than the other.
  • the second element 29 also comprises a cylindrical portion 34 provided with a radially outward projecting cam portion 35 on which the pin 26 is provided.
  • Arch-shaped recesses 36 and 37 are provided in the inner wall of the cylindrical portion 34 to house the ends 24 and 25 of the second spiral spring 23, which are free to rock.
  • the cylindrical portion 34 of the second element 29 is able to receive in a coaxial position the cylindrical portion 30 of the first element 28 such that the flange portion 31 of the first element 28 and the cam portion 35 of the second element 29 are positioned on the distant opposing ends of the two elements 28 and 29.
  • the spring 23, with the elements 28 and 29 of the cam unit mounted in this manner, is seated on a cylindrical end portion 38 of the drive bush 20, which is housed coaxially within the cylindrical portion 30.
  • the endpiece 17 is of flattened prismatic box form to house the device of the present invention.
  • an inwardly projecting abutment tooth 39 arranged to engage with an arch-shaped perimetral recess 40 provided in the cylindrical portion 30 of the first element 28 of the cam unit.
  • a plate 41 On its open other side which faces the roller there is provided a plate 41 which besides acting as a closure element also supports the stop element 27.
  • the plate 41 is perforated centrally at 42 to house a flange-shaped wall 43 provided on the drive bush 20 in an intermediate region thereof.
  • the plate 41 also carries, secured in a fixing eyelet 44, an end appendix 45 of the stop element 27, which in the illustrated embodiment consists of a hook element.
  • the hook element 27 is of C-shape, a base of which is provided with said appendix 45. On one free end on the open side of the C there is provided an inner abutment surface 46 for the pin 26, and on the other free end there is provided an outer slide surface 47 for the pin 26.
  • a hole 48 in the body of the hook element 27 secures one end of a spring 49, the other end of which is rigid with the plate 41. In this manner the hook element is normally maintained rotated towards the axis of the device.
  • the intermediate part of the body of the hook element 27 carries on its inside a deviator element 50 positioned in proximity to that end distant from the end provided with the appendix 45 and interacting with the pin 26.
  • a projection 51 extends from the outer surface of the intermediate part of the body of the hook element 27 to maintain the hook element 27 raised and spaced from the plate 41.
  • the automatic tensioning and locking device for blinds and/or mosquito-curtains according to the present invention operates in the following manner.
  • the netting 14 can be unwound from the roller contained in the roller box 13, on which it is wound.
  • the bar 21 is pulled downwards so that the netting descends within the lateral guides 15.
  • the device which was initially in the position shown in Figure 4, assumes the position of Figure 5, ie the unwinding of the netting 14 causes the roller and the drive bush 20 rigid with it to rotate.
  • the drive bush 20 carries, rigidly wound about it, the spring 23 one end 24 of which abuttingly engages in the arched recess 36 to also rotate the second element 29 of the cam unit.
  • the pin 26 hence rotates, slides on the outer sliding surface 47 and engages against the inner abutment surface 46 of the hook element 27, to halt.
  • the spring 23 wound about the drive bush 20 is hence compelled to open on account of the continuing rotation of the bush 20, to enable unwinding of the netting 14 to continue.
  • the bar 21 is at the end of its travel, hooked to the stop elements 22 within the guides 15.
  • the pin 26 slides along that inner surface of the hook element opposite the surface 47 and becomes retainedly positioned within the hook element as shown in Figure 6. In this position, rewinding of the netting 14 onto the roller is prevented.
  • the pin 26 slides against the intermediate part of the body of the hook element 27 until it interacts with the deviator element 50, which enables it to leave the hook element 27.
  • the first element 28 of the cam unit also rotate until the arched recess 40 abuts against the abutment tooth 39 as shown in Figure 4.
  • the arched recess 36 of the second element 29 of the cam unit moves into engagement with the end 24 of the spring 23.
  • the spring 23 wound about the drive bush 20 is consequently obliged to open by the continuing rotation of the bush 20, to enable the winding of the netting 14 onto the roller to continue.
  • the return spring 18 moves to determine this rewinding by overcoming the force of the spring 23.
  • the device of the present invention enables the blind and/or netting to be automatically locked and tensioned in its position of maximum unwinding, independently of the extent of this unwinding. Consequently no preparation is required on installing the blind or mosquito-curtain, as the device is self-adjusting.
  • the lower bar can also be halted in any position along its possible unwinding path. This advantage is particularly useful in the case of a roller blind in which its lowering can be adjusted at will.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Insects & Arthropods (AREA)
  • Pest Control & Pesticides (AREA)
  • Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)
  • Catching Or Destruction (AREA)
  • Curtains And Furnishings For Windows Or Doors (AREA)
  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
EP94200784A 1993-04-05 1994-03-30 Automatic tensioning and locking device for roller blinds and mosquito-curtains Expired - Lifetime EP0621392B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI930665A IT1263997B (it) 1993-04-05 1993-04-05 Dispositivo automatico di tensione e bloccaggio per tende e zanzariere avvolgibili
ITMI930665 1993-04-05

Publications (3)

Publication Number Publication Date
EP0621392A2 EP0621392A2 (en) 1994-10-26
EP0621392A3 EP0621392A3 (en) 1995-03-08
EP0621392B1 true EP0621392B1 (en) 1997-04-23

Family

ID=11365641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94200784A Expired - Lifetime EP0621392B1 (en) 1993-04-05 1994-03-30 Automatic tensioning and locking device for roller blinds and mosquito-curtains

Country Status (4)

Country Link
EP (1) EP0621392B1 (it)
AT (1) ATE152208T1 (it)
DE (1) DE69402753D1 (it)
IT (1) IT1263997B (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5853040A (en) * 1995-09-22 1998-12-29 Benthin Aktiengesellschaft Cassette blind with brake coupling

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4662423A (en) * 1982-10-31 1987-05-05 Kabushiki Kaisha Nichibei Device for operating roll-screen
CH655544B (it) * 1983-11-18 1986-04-30
DE4005519A1 (de) * 1990-02-22 1991-08-29 Sven Erik Malmstroem Rollvorhangmechanismus

Also Published As

Publication number Publication date
EP0621392A3 (en) 1995-03-08
ATE152208T1 (de) 1997-05-15
EP0621392A2 (en) 1994-10-26
DE69402753D1 (de) 1997-05-28
IT1263997B (it) 1996-09-06
ITMI930665A0 (it) 1993-04-05
ITMI930665A1 (it) 1994-10-05

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